Sodium 2-naphthalenesulfonate

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  • Identifiers

    CAS number
    532-02-5

    Molecular formula
    C10H7NaO3S

    SMILES
    C1=CC=C2C=C(C=CC2=C1)S(=O)(=O)[O-].[Na+]

    Safety labels

    Irritant
    Irritant

  • Odor profile

    Fragrance
    Odorless 70.25%
    Bitter 23.26%
    Burnt 21.6%
    Cooked 21.5%
    Sulfurous 18.08%
    Pungent 18.0%
    Balsamic 16.84%
    Savory 16.26%
    Aromatic 15.56%
    Clean 14.35%

     

    Flavor
    Bitter 74.42%
    Odorless 24.93%
    Nitrile 22.12%
    Urine 20.12%
    Moth ball 19.31%
    Very strong 19.29%
    Balsam 19.15%
    Tar 19.04%
    Indole 19.02%
    Naphthelene 18.98%

     

    Odor impact est.
    Low

  • Properties

    pKa est.
    4.58 (weak acid)

    Molecular weight
    230.22 g/mol

    Melting point expt.

    • 275 °C
    • Prisms from +2 water, dilute hydrochloric acid. MP: 140 °C. Soluble in water, ethanol; slightly soluble in ether /1-Naphthalenesulfonic acid/

    Flash point

    • 148.14 ˚C est.

    Solubility expt.

    • Soluble in water

  • Synonyms

    • Sodium 2-naphthalenesulfonate
    • 532-02-5
    • 2-Naphthalenesulfonic acid sodium salt
    • 2-Naphthalenesulfonic acid, sodium salt
    • Sodium naphthalene-2-sulphonate
    • Sodium naphthalene-6-sulfonate
    • Sodium-2-naphthalenesulfonate
    • Sodium beta-naphthalenesulfonate
    • UNII-R5F0CTD2OJ
    • R5F0CTD2OJ
    • beta-Naphthalenesulfonic sodium salt
    • NSC 7415
    • EINECS 208-523-8
    • DTXSID4041442
    • DTXCID2021442
    • HSDB 8397
    • NSC-7415
    • SODIUM 2-NAPHTHALENESULPHONATE
    • SODIUM NAPHTHALENE-6-SULPHONATE
    • NSA
    • SODIUM 2-NAPHTHALENESULFONATE (II)
    • SODIUM 2-NAPHTHALENESULFONATE [II]
    • RefChem:9160
    • sodium beta-naphthalenesulphonate
    • beta-naphthalenesulfonic acid sodium salt
    • 208-523-8
    • Sodium naphthalene-2-sulfonate
    • MFCD00064186
    • 2-Naphthalenesulfonic acid (sodium salt)
    • sodium;naphthalene-2-sulfonate
    • 2-Naphthalenesulfonic acid, sodium salt (1:1)
    • Sodium .beta.-naphthalenesulfonate
    • Sodium2-naphthalenesulfonate
    • Sodium salt of beta-naphthalenesulfonic acid
    • Naphthalene-2-sulfonic acid sodium salt
    • SCHEMBL125148
    • sodium 2-naphthalene sulfonate
    • CHEMBL3184462
    • SCHEMBL29368068
    • SCHEMBL30079649
    • 2-Naphthalenesulfonic acid sodium
    • Tox21_301018
    • AC7882
    • AKOS015897315
    • AKOS015964252
    • 2-Naphthalenesulphonic acid sodium salt
    • FN55160
    • naphthalene-2-sulfonic acid, sodium salt
    • NCGC00254920-01
    • AC-18240
    • AS-12634
    • CAS-532-02-5
    • SY005670
    • SODIUM .BETA.-NAPHTHALENESULPHONATE
    • DB-052270
    • CS-0010108
    • I0353
    • N0016
    • ST51037889
    • Sodium 2-naphthalenesulfonate, >=95% (HPLC)
    • .BETA.-NAPHTHALENESULFONIC ACID SODIUM SALT
    • F051154
    • Sodium 2-naphthalenesulfonate, technical, >=90%
    • Sodium 2-naphthalenesulfonate, technical grade, 90%
    • Q27287821
    • Sodium 2-naphthalenesulfonate, for ion pair chromatography, >=99.0% (HPLC)
    • 532-02-5

  • Applications

    Sodium 2-naphthalenesulfonate (CAS 532-02-5) is used primarily as an anionic surfactant and dye/pigment dispersant in textile processing and paper production, and as a chemical intermediate in the synthesis of sulfonated naphthalene derivatives for dyes, pigments, and resins. It also serves as a wetting and leveling agent in coatings and inks to improve dispersion and color uniformity. In the chemical and polymer sectors, it can act as a building block for sulfonated aromatic polymers and resin formulations. Additionally, cleaning formulations and detergent systems may exploit its surface-active properties. These applications reflect typical roles as an intermediate, dispersant, surfactant, and formulation component; subject to local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 31.57
    methanol 34.95
    isopropanol 11.39
    water 0.04
    ethyl acetate 147.85
    n-propanol 20.45
    acetone 133.32
    n-butanol 15.19
    acetonitrile 99.54
    DMF 452.0
    toluene 63.51
    isobutanol 9.39
    1,4-dioxane 190.51
    methyl acetate 183.19
    THF 328.66
    2-butanone 185.3
    n-pentanol 13.91
    sec-butanol 20.96
    n-hexane 0.69
    ethylene glycol 13.58
    NMP 720.86
    cyclohexane 1.75
    DMSO 281.74
    n-butyl acetate 94.82
    n-octanol 15.3
    chloroform 67.59
    n-propyl acetate 73.62
    acetic acid 42.48
    dichloromethane 159.5
    cyclohexanone 165.33
    propylene glycol 12.9
    isopropyl acetate 76.04
    DMAc 415.68
    2-ethoxyethanol 87.14
    isopentanol 13.64
    n-heptane 1.72
    ethyl formate 62.27
    1,2-dichloroethane 175.8
    n-hexanol 24.32
    2-methoxyethanol 146.99
    isobutyl acetate 22.94
    tetrachloromethane 5.35
    n-pentyl acetate 61.75
    transcutol 611.84
    n-heptanol 14.5
    ethylbenzene 28.17
    MIBK 45.91
    2-propoxyethanol 100.28
    tert-butanol 15.46
    MTBE 37.89
    2-butoxyethanol 58.74
    propionic acid 42.1
    o-xylene 37.22
    formic acid 35.59
    diethyl ether 67.24
    m-xylene 28.97
    p-xylene 24.14
    chlorobenzene 84.65
    dimethyl carbonate 99.72
    n-octane 0.68
    formamide 196.1
    cyclopentanone 324.45
    2-pentanone 100.08
    anisole 136.97
    cyclopentyl methyl ether 110.87
    gamma-butyrolactone 426.37
    1-methoxy-2-propanol 97.11
    pyridine 285.15
    3-pentanone 104.79
    furfural 430.79
    n-dodecane 0.56
    diethylene glycol 83.07
    diisopropyl ether 14.67
    tert-amyl alcohol 27.38
    acetylacetone 205.11
    n-hexadecane 0.71
    acetophenone 144.07
    methyl propionate 155.56
    isopentyl acetate 65.03
    trichloroethylene 359.49
    n-nonanol 14.68
    cyclohexanol 17.71
    benzyl alcohol 66.04
    2-ethylhexanol 18.84
    isooctanol 11.01
    dipropyl ether 31.61
    1,2-dichlorobenzene 89.33
    ethyl lactate 37.26
    propylene carbonate 154.54
    n-methylformamide 189.22
    2-pentanol 13.65
    n-pentane 0.91
    1-propoxy-2-propanol 65.46
    1-methoxy-2-propyl acetate 138.36
    2-(2-methoxypropoxy) propanol 95.61
    mesitylene 13.17
    ε-caprolactone 202.18
    p-cymene 19.33
    epichlorohydrin 558.06
    1,1,1-trichloroethane 59.19
    2-aminoethanol 23.88
    morpholine-4-carbaldehyde 536.66
    sulfolane 473.92
    2,2,4-trimethylpentane 0.92
    2-methyltetrahydrofuran 196.73
    n-hexyl acetate 84.62
    isooctane 0.5
    2-(2-butoxyethoxy)ethanol 134.87
    sec-butyl acetate 49.61
    tert-butyl acetate 87.79
    decalin 1.98
    glycerin 29.59
    diglyme 325.8
    acrylic acid 59.65
    isopropyl myristate 23.79
    n-butyric acid 37.45
    acetyl acetate 100.78
    di(2-ethylhexyl) phthalate 29.35
    ethyl propionate 74.96
    nitromethane 341.21
    1,2-diethoxyethane 137.5
    benzonitrile 99.42
    trioctyl phosphate 16.14
    1-bromopropane 40.38
    gamma-valerolactone 433.98
    n-decanol 10.3
    triethyl phosphate 34.94
    4-methyl-2-pentanol 7.6
    propionitrile 48.75
    vinylene carbonate 137.6
    1,1,2-trichlorotrifluoroethane 202.15
    DMS 148.39
    cumene 14.27
    2-octanol 10.55
    2-hexanone 66.28
    octyl acetate 36.48
    limonene 26.32
    1,2-dimethoxyethane 162.13
    ethyl orthosilicate 28.21
    tributyl phosphate 24.48
    diacetone alcohol 97.25
    N,N-dimethylaniline 64.88
    acrylonitrile 117.51
    aniline 75.66
    1,3-propanediol 29.65
    bromobenzene 79.32
    dibromomethane 64.15
    1,1,2,2-tetrachloroethane 201.91
    2-methyl-cyclohexyl acetate 51.7
    tetrabutyl urea 38.56
    diisobutyl methanol 9.84
    2-phenylethanol 67.25
    styrene 41.06
    dioctyl adipate 50.35
    dimethyl sulfate 193.63
    ethyl butyrate 68.46
    methyl lactate 76.91
    butyl lactate 47.73
    diethyl carbonate 47.94
    propanediol butyl ether 61.25
    triethyl orthoformate 40.23
    p-tert-butyltoluene 17.18
    methyl 4-tert-butylbenzoate 80.36
    morpholine 222.21
    tert-butylamine 6.78
    n-dodecanol 6.84
    dimethoxymethane 192.9
    ethylene carbonate 82.85
    cyrene 106.95
    2-ethoxyethyl acetate 167.41
    2-ethylhexyl acetate 55.55
    1,2,4-trichlorobenzene 128.5
    4-methylpyridine 219.29
    dibutyl ether 25.05
    2,6-dimethyl-4-heptanol 9.84
    DEF 208.05
    dimethyl isosorbide 220.85
    tetrachloroethylene 112.61
    eugenol 88.91
    triacetin 130.28
    span 80 57.02
    1,4-butanediol 11.03
    1,1-dichloroethane 63.7
    2-methyl-1-pentanol 16.39
    methyl formate 153.12
    2-methyl-1-butanol 16.56
    n-decane 1.02
    butyronitrile 32.74
    3,7-dimethyl-1-octanol 16.64
    1-chlorooctane 9.62
    1-chlorotetradecane 3.25
    n-nonane 0.87
    undecane 0.74
    tert-butylcyclohexane 1.32
    cyclooctane 0.93
    cyclopentanol 28.14
    tetrahydropyran 100.54
    tert-amyl methyl ether 50.81
    2,5,8-trioxanonane 199.47
    1-hexene 6.06
    2-isopropoxyethanol 53.57
    2,2,2-trifluoroethanol 30.23
    methyl butyrate 86.78

    Scent© AI

1 4

IFRA standard 51

Recommendation
No restriction
Maximum acceptable concentrations in the finished product (%)
Category 1
Products applied to the lips
 No restriction Category 7A
Rinse-off products applied to the hair with some hand contact
 No restriction
Category 2
Products applied to the axillae
 No restriction Category 7B
Leave-on products applied to the hair with some hand contact
 No restriction
Category 3
Products applied to the face/body using fingertips
 No restriction Category 8
Products with significant anogenital exposure
 No restriction
Category 4
Products related to fine fragrance
 No restriction Category 9
Products with body and hand exposure, primarily rinse off
 No restriction
Category 5A
Body lotion products applied to the body using the hands (palms), primarily leave on
 No restriction Category 10A
Household care products with mostly hand contact
 No restriction
Category 5B
Face moisturizer products applied to the face using the hands (palms), primarily leave on
 No restriction Category 10B
Household care products with mostly hand contact, including aerosol/spray products (with potential leave-on skin contact)
 No restriction
Category 5C
Hand cream products applied to the hands using the hands (palms), primarily leave on
 No restriction Category 11A
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate without UV exposure
 No restriction
Category 5D
Baby Creams, baby Oils and baby talc
 No restriction Category 11B
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate with potential UV exposure
 No restriction
Category 6
Products with oral and lip exposure
 No restriction Category 12
Products not intended for direct skin contact, minimal or insignificant transfer to skin
 No restriction